单项选择 适中0.65 引用5 组卷508
It is through years of research ________ scientists have discovered the relationship between social media addiction and depression.
| A．since | B．before | C．that | D．when |
2018·江苏·一模
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— I wonder made him get the top position in the company.
— His ability to deal with the urgent problems.
— His ability to deal with the urgent problems.
| A．how was it that | B．how it was that |
| C．what was it that | D．what it was that |
It was not until he graduated from high school________ he realized his mistake.
| A．when | B．that | C．where | D．since |
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